Picked up the XtremeMusic version of Creative's newest cards-got it home and couldn't even boot windows at all with it installed. Went to Creative's forums and there are many frustrated people with NF4 motherboards that the lower two versions of these sound cards don't work with. Creative has a fix but you have to ship the card to them and the will fix and send back.Some mobo manufacturers have released a bios update that fixes this problem as well but only a few of them. Supposedly the newest shipping sound cards don't have this problem but I just bought mine today 12/27/05 and no go. I'm just going to return mine.